| 单词 | astatine |
| 释义 | astatine (once / 2363863 pages) n WORD FAMILY astatine USAGE EXAMPLESA fundamental property of the rarest element on Earth, astatine, has been discovered for the first time, scientists say. Scientific American(May 17, 2013) In the early 1950s, he belonged to a team of physicists credited with discovering the radioactive element astatine. New York Times(Apr 06, 2012) Astatine was first made at Berkeley by bombarding bismuth with alpha particles, which produced astatine and released two neutrons. Watson, Glen W., A Brief History of Element Discover...(2010) n a highly unstable radioactive element (the heaviest of the halogen series); a decay product of uranium and thorium Syn|Hyper At, atomic number 85 chemical element, element any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter halogenany of five related nonmetallic elements (fluorine or chlorine or bromine or iodine or astatine) that are all monovalent and readily form negative ions |
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